LT1 Piston/Rod Assembly ?
Thread Starter
Safety Car
Joined: Jul 1999
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From: Marianna FL
LT1 Piston/Rod Assembly ?
I'm starting to reassemble my LT1 for the 95 Corvette and the piston/rod assemblies do not seem to make sense the way they are numbered. The pistons have arrows which the service manual says should point to the front (as usual). The rods have a chamfer that goes toward the fillet on the crank and the other side of the rod obviously has been rotating against the adjacent rod. When the pistons are arranged according to the numbered order and turned according to how the rods should be oriented, some of the arrows on the pistons do not point forward. Has anyone ever run into this? Do you think the machine shop misnumbered the pistons or did the factory put the pistons on the rods backwards? The pistons have not been removed from the rods, as they were only cleaned, checked, and numbered at the machine shop.
I remember pulling apart an engine years ago with some pistons in backwards and it had a lot of trouble free miles on it. Is the mark related to the piston construction or is it there to make assembly more idiot proof?
I remember pulling apart an engine years ago with some pistons in backwards and it had a lot of trouble free miles on it. Is the mark related to the piston construction or is it there to make assembly more idiot proof?
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
I'm thinking when I rebuilt my '95 that the stock pistons, which I didn't reuse, had four valve reliefs so Mr. Goodwrench couldn't get them in backwards. So you should be able to orient the rods per the manual and not worry about the pistons.
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Mr Dave
Do you think the machine shop misnumbered the pistons or did the factory put the pistons on the rods backwards? The pistons have not been removed from the rods, as they were only cleaned, checked, and numbered at the machine shop.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by Corvette Kid NC
It doesn't matter which hole a rod came out of anyway, or piston for that matter, assuming all rings and pistons will be new which I'm sure is the case.
RACE ON!!!
Melting Slicks
Joined: Jan 2002
Posts: 3,293
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From: Jackson MI
Here's what your problem is ........ You put the backwards pistons on the wrong bank! If you notice you'll have the same number of backwards pistons on the even and odd sides. Someone must have misnumbered the pistons, that's the only explination.
